Keep logs to study your online profile and decide what you can knock out, download a program like Freedom that locks you out of your browser, or take a "digital Sabbath".
Moving the messages will always delete their originals after the copies have been made in the destination mailbox, as implemented by mail: : IMAPClient.
As I took pictures of the outside of the sales office, I was approached by two security guards who demanded to look at my camera and insisted I deleted any pictures of the building.
Researchers at Cambridge University have found that nearly half of the social networking sites don't immediately delete pictures when a user requests they be removed.
I would go up for adminship, but it's more trouble than it's worth since I don't do vandal-whacking and/or deletion discussion about articles I don't care about.